دلیل خطای The insert statement conflicted with the FOREIGN KEY

باسلام.یک برنامه طراحی کردم که شامل چند جدول هست که باهم مرتبط شدند.اما در زمان add کردن در جدول tblDeliver خطا میده و نمیشه به این جدول رکوردی اضافه کرد.

tblUser

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace Tools_Store
{
    class tblUser
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        [StringLength(6)]
        public string PersonId { get; set; }
        [MaxLength(50)]
        [Required]
        public string PersonName { get; set; }
        [MaxLength(50)]
        
        public string WorkGroup { get; set; }
        [MaxLength(6)]
        [Required]
        public string TypeUser { get; set; }
        [MaxLength(50)]
        [Required]
        public string UserName { get; set; }
        [MaxLength(50)]
        [Required]
        public string Password { get; set; }
        [StringLength(11)]
        public string PhoneNumber { get; set; }
        [MaxLength(255)]
        public string personNote { get; set; }
        public virtual ICollection<tblDeliver> TblDeliver { get; set; }

    }
}

tblTools

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tools_Store.Model.DB
{
    class tblTools
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        [MaxLength(10)]
        public string ToolsCode { get; set; }
        [MaxLength(100)]
        [Required]
        public string ToolsName { get; set; }
        [Required]
        public int Qty { get; set; }
        [Required]
        [MaxLength(15)]
        public string Unit { get; set; }
        [MaxLength(20)]
        public string LocTools { get; set; }
        [Required]
        public int IDAnbar { get; set; }
        public int Mojudi { get; set; }
        public virtual ICollection<tblNewTools> TblNewTools { get; set; }
        public virtual ICollection<tblDeliver> TblDeliver { get; set; }
        public virtual ICollection<tblAnbarTools> TblAnbarTools { get; set; }

    }
}

tblNewTools

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tools_Store.Model.DB
{
    class tblNewTools
    {
        [Key]
        public int Id { get; set; }
        [MaxLength(10)]
        [Required]
        public string ToolsCode { get; set; }
        [MaxLength(100)]
        [Required]
        public string ToolsName { get; set; }
        [Required]
        public int Qty { get; set; }
        [Required]
        [MaxLength(15)]
        public string Unit { get; set; }
        [MaxLength(20)]
        public string LocTools { get; set; }
        [MaxLength(10)]
        public string Anbar { get; set; }
        [MaxLength(10)]
        public string DateReg { get; set; }
        [StringLength(6)]
        public string IdPersonReg { get; set; }
        [MaxLength(255)]
        public string Note { get; set; }
        public virtual tblTools TblTools { get; set; }
        public virtual tblAnbarTools TblAnbarTools { get; set; }
    }
}

tblMoveTools

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tools_Store.Model.DB
{
    class tblMoveTools
    {
        [Key]
        public int id { get; set; }
        [Required]
        public int IdAnbarOut { get; set; }
        [MaxLength(10)]
        [Required]
        public string CodeToolsOut { get; set; }
        [Required]
        public int IdAnbarIn { get; set; }
        [MaxLength(10)]
        [Required]
        public string CodeToolsIn { get; set; }
        [MaxLength(100)]
        [Required]
        public String NameTools { get; set; }
        [Required]
        public int Qty { get; set; }
        [MaxLength(10)]
        public string DateReg { get; set; }
        [StringLength(6)]
        public string IdPersonReg { get; set; }
        [MaxLength(255)]
        public string Note { get; set; }
        public virtual tblAnbarTools TblAnbarTools { get; set; }
    }
}

tblDeliver

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tools_Store.Model.DB;

namespace Tools_Store
{
    class tblDeliver
    {
        [Key]
        public int DeliverID { get; set; }
        [MaxLength(10)]
        public string ToolsCode { get; set; }
        [MaxLength(100)]
        [Required]
        public string ToolsName { get; set; }
        [Required]
        public int Qty { get; set; }
        [Required]
        [MaxLength(15)]
        public string Unit { get; set; }
        [MaxLength(20)]
        public string LocTools { get; set; }
        [Required]
        public int IDAnbar { get; set; }
        [MaxLength(10)]
        public string DateDeliver { get; set; }
        [StringLength(6)]
        public string IdPersonDeliver { get; set; }
        [StringLength(6)]
        public string IdPersonReg { get; set; }
        [MaxLength(10)]
        public string DateReceive { get; set; }
        [StringLength(6)]
        public string IdPersonReceive { get; set; }
        [MaxLength(255)]
        public string Note { get; set; }
        public bool Select { get; set; }
        public virtual tblTools TblTools { get; set; }
        public virtual tblUser TblUser { get; set; }
        public virtual tblMissingTools  TblMissingTools { get; set; }
        public virtual tblAnbarTools TblAnbarTools { get; set; }
    }
}

tblAnbarTools

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tools_Store.Model.DB
{
    class tblAnbarTools
    {
        [Key]
        public int IdAnbar { get; set; }
        [MaxLength(10)]
        public string NameAnbar { get; set; }
        public virtual ICollection<tblNewTools> TblNewTools { get; set; }
        public virtual ICollection<tblDeliver> TblDeliver { get; set; }
        public virtual ICollection<tblTools> TblTools { get; set; }
        public virtual ICollection<tblMoveTools> TblMoveTools { get; set; }
    }
}

و مدل DbContext

ModelContext

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tools_Store.Model.DB;

namespace Tools_Store.Model.Context
{
    class ModelContext : DbContext
    {
        public ModelContext() : base("name=mycon") { }
        public DbSet<tblUser> user { get; set; }
        public DbSet<tblTools> tools { get; set; }
        public DbSet<tblMissingTools>  missingTools { get; set; }
        public DbSet<tblNewTools> newTools { get; set; }
        public DbSet<tblMoveTools> moveTools { get; set; }
        public DbSet<tblAnbarTools> anbarTools { get; set; }
        public DbSet<tblDeliver> deliver { get; set; }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<tblTools>()
            .HasMany(a => a.TblNewTools)
            .WithRequired(s => s.TblTools)
            .HasForeignKey(g => g.ToolsCode);
			
            modelBuilder.Entity<tblDeliver>()
                .HasKey(p => p.DeliverID)
                .HasOptional(e => e.TblMissingTools)
                .WithRequired(e => e.TblDeliver);
           
            modelBuilder.Entity<tblTools>()
                .HasMany(a => a.TblDeliver)
                .WithRequired(s => s.TblTools)
                .HasForeignKey(g => g.ToolsCode);
        }
    }
}

و رشته اتصال (connectionStrings)

<connectionStrings>
  <add name="mycon" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=DB_Tools_Store;User ID=sa;Password=1;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" 
       providerName="System.Data.SqlClient" />
</connectionStrings>

و حالا قطعه کدی که به رکورد به جدول tblDeliver میافزاید که در زمان SaveChanges خطا میده.

tblDeliver DeliverTools = new tblDeliver()
                {
                    IdPersonDeliver = cmbIdPerson.Text,
                    ToolsCode = cmbCodeTools.Text,
                    ToolsName = cmbNameTools.Text,
                    Qty = int.Parse(txtQty.Text),
                    Unit = cmbUnit.Text,
                    LocTools = qt.LocTools,
                    IDAnbar = Varibel.NumAnbar,
                    DateDeliver = DatePickerDeliver.Text,
                    Select = false,
                    IdPersonReg=Varibel.id
                };
db.deliver.Add(DeliverTools);
db.SaveChanges();

ممنون میشم راهنمایی بفرمایید که آیا ایراد در ارتباط بین جداوله یا جایی دیگر.